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<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      function checkSpam(str = "") {
        const lowerStr = str.toLowerCase();
        return lowerStr.indexOf("viagra") !== -1 || str.includes("xxx");
        // if (lowerStr.includes("viagra") || str.includes("xxx")) {
        //   return true;
        // } else {
        //   return false;
        // }
      }
      console.log(checkSpam("buy ViAgRA now")); // true;
    </script>
  </body>
</html>
